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Related Concept Videos

Colloids and Suspensions01:17

Colloids and Suspensions

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
Colloids03:22

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
Plastic Behavior01:21

Plastic Behavior

A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and reloaded.
Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent – the...

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Updated: Jun 18, 2026

Challenges in Rheological Characterization of Highly Concentrated Suspensions — A Case Study for Screen-printing Silver Pastes
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Ageing and yield behaviour in model soft colloidal glasses.

C Christopoulou1, G Petekidis, B Erwin

  • 1Foundation for Research and Technology Hellas, Institute of Electronic Structure and Laser, Road to Voutes, Crete, Greece.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|November 26, 2009
PubMed
Summary
This summary is machine-generated.

Multi-arm star polymers exhibit complex glassy behavior, with distinct two-step aging processes. Their response to stress reveals unique yielding characteristics, differing from other soft glasses.

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Area of Science:

  • Soft Matter Physics
  • Polymer Science
  • Colloid Science

Background:

  • Star polymers serve as model systems for soft colloids.
  • Understanding the glassy state of soft matter is crucial for materials science.
  • Ageing and shear effects significantly influence the rheology of glassy materials.

Purpose of the Study:

  • To investigate the rheological behavior of multi-arm star polymers in the glassy state.
  • To explore the phenomena of ageing and shear melting in star glasses.
  • To characterize the yielding behavior and its relation to the material's structure.

Main Methods:

  • Systematic rheological studies using a well-defined protocol.
  • Creep and recovery tests to probe material response over time.
  • Analysis of stress-dependent recoverable strain to understand yielding.

Main Results:

  • Ageing occurs in two distinct steps: a fast (O(10^3) s) and a slow (O(10^4) s) process.
  • Creep curves show three regimes: viscoplastic, intermediate steady flow, and evolving elastic solid.
  • Yielding behavior indicates a nonlinear elastic response, distinct from other soft glasses.

Conclusions:

  • Multi-arm star polymers display unique ageing and yielding characteristics in their glassy state.
  • The interplay between ageing and shear rejuvenation governs the observed rheological response.
  • These findings suggest a potential for phenomenological classification of colloidal glasses based on yielding.